Plastic composition



STANLEY H. R001), OF HARTFORD, CONNECTICUT.

' ELASTIC COMPOSITION.

To all whom it may concern: v

Be it known that I, STANLEY H. ROOD, a citizen of the United States,residing at Hartford, in the county of Hartford'and State ofConnecticut, have invented a new and useful Improvement in PlasticCompositions, of which the following is a specification.

This invention relates to a composition of matter which is particularlyserviceable for use as material for making gaskets employed for thehermetic sealing of'tumblers, jars, cans or bottles, but which may beemployed for a variety of other purposes.

The object of the invention is to produce a material especially usefulfor this purpose having a composition which renders it inert toward allordinary foods put up in such containers.

/ This omposition has a base of caoutchouc so admixed with othermaterials as to form'a compound suitable for use in what may be termed araw, that is, an unvulcanized or partially vulcanized state.

The composition is composed of the following ingredients: crude rubber,preferably in the form known to the trade as washed and dried; a wax, asfor instance,

' ing matter, 5 parts. I are not the only onessuita'ble for a mixture.forithe urpose specified, but a compound paraifin or ceresin; anon-drying oil, either mineral, such as petrolatum, or vegetable,

such as castor oil; and an inertfiljler such as infusorial earth, talc,barytes, or kaolin; and

if desired an inert coloring material, such as red iron oxid or carbonblack. These ingredients may be combined in about the followingproportions, by weight: crude rubber, 15 parts; wax, 20 parts;non-drying oil, 5 parts; inert filler, 55 parts; inerrt color- Theaboveproportions compose of the parts as above stated has proved satisfactoryin meetlng the require- 'ments of an etl'ective and economical hermeticclosure.

' In making this composition the preferred 7 procedure is to first meltthe paraflin in a suitable vessel, such as a steam j Specification ofLetters Patent.

proportions of the two ingredients.

acketed Patented Nov. 25, 1919.

No Drawing. Application filed may 11, 1918, Serial No. 233,857. RenewedJune 12,1919. Serial 110.303,?72.

mixing-kettle of sufiicient capacity to allow for the subsequent addingof the petrolatum and its thorough incorporation with the moltenparaflin. When the blending is complete the mass is poured out andallowed to cool, the hardness of the resulting mixture being dependentupon the relative function of the parafiin is to make the gasket lessliable to adhere to the surface of, the container which is sealed, whilethe oil lessens the hardness of the compound and renders it lesssusceptible to wide changes in temperature. The parafiin-pe-trolatummixture, crude rubber, filler and coloring matter are then compoundedand blended by mixing rolls or by other wellknown means according to theusual procedure in the art of rubber manufacture so as to obtain auniform and intimate mixture. This material can then be run through anextrusion machine, or otherwise manipulated into gasket form. 3

The invention claimed is; 1. The hereindescribed composition of matterconsisting of caoutchouc, wax, nondrying oil, inert filler, and coloringmatter.

2. The herein-described composition of matter consisting of caoutchouc,paraflin,

non-dryizng oil, inert filler, and colorlng matter, in about theproportions named.

3. The herein-described composition of matter consisting of caoutchouc,paraflin, petrolatum, inert filler, and coloring matter, in about theproportions named.

The.

4. The herein-described composition of matter consisting of caoutchouc,paraflin, petrolatum, infusorial earth, and coloring matter, in aboutthe proportions named.

5. The herein-described composition of matter consisting of caoutchouc,'paraflin, petrolatum, infusorial earth, and red oxid of iron, in aboutthe proportions named.

- 6. The herein described composition of drying oil and inert filler. L

' STANLEY H. noon.

matter consisting of'caoutchouc, wax, non-

